Electric condenser.



No. 873,053l

F. S. KOCH, ELECTRIC CONBENSER.

APPLIGATION FILED JUHE 2931904 2 SHEETS-SHEET l.

QE/F5 X37/WW@ PATENTED DLGx l0, 1907.

No. 873,053. PATBNTBD DBC. l0, 1907. F. S. KOCH.

ELECTRIC CONDENSER.

APPLICATICN FILED JUNE 29, 1904.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

FRANK S. KOCH, OF CHICAGO, ILLINOIS, ASSIGNOR TO KELLOGG SWITCHBOARD & SUPPLY COMPANY, OF CHICAGO, ILLINOIS,` A CORPORATION OF ILLINOIS.

ELECTRIC OONDENBEB.

Specification of Letters Patent.

Patented Dec. 10, 1907.

To all whom 'Lt may concern:

Be it known that I, FRANK S. KOCH, a citizen of the United States of America, and resident of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Electric Cond ensers, of which the following is a specification.

My invention relates to improvements in electric condensers, my object being' to reduce the size of the condensers per unit capacity, as well as the material'and labor involved, thereb not only cheapening their rst cost, vbut so chea ening the cost of shipping and rendering t e same more convenient for assembling 1n telephones or other places.

In carrylng out m invention I provide suitable means for ro the material, consisting of tin foil lo1' other material for the plates and paper forming the dielectric, into oblo or flattened rolls, which rolls are then folde upon themselves into two or more layers and are next subjected to a bath of molten parafiin or other insulating substance, and are later` compressed or s ueezed in a suitable mold which Implarts to t e condenser a definite form or s ape and which also compresses the sheets or leaves together in such compact form as to bring the plates into close inductive relation at all points. A suitable casing having 'exterior terminals may then be provided for the condenser to ple'otect the same in use, the said terminals ing electrically connected with the plates of the condenser.

My invention is illustrated in the accoml panying drawings, in which the same reference characters are used throughout to designate like parts, and in which:

F' e 1 is a side view of the apparatus emp loyed for the initial step in the rocess, that is, for making the flattened ro s; Fig. 2 is a side view of the form u n which the condensers are wound Fig. 3 1s an end view of the same; Fig. 4 is an end view of the roll after it is taken from the form;` Fig. 5 is a view of the paraffin bath to which the condensers are subjected; Fi 6 is a side view of the mold in which t e condensers are com ressed; Fig. 7 is a plan view of the mol Fig. 8 is aA cross-section of said mold; Fig. 9 is an end view thereof, and Fig. 10 shows a suitable press in which the molds are placed'to form the condensers; Fig. 11

foil. A good quality of plain rice shows an S-sha ed condenser after it has been compresse and provided with a suitable core; Fig. 12 shows a similar view of a U-shaped condenser; Fig. 13 is a pers ctive view of a W shaped condenser; 14 shows a suitable casing therefor; Fig. 15 shows the casing after the condenser has been inserted' and the top plate applied; and Fig. 16 shows the end of the completed condenser after the casing has been sealed with a suitable composition.

Referring to F 1, suitable rolls 2 of aper or other dielectric of the desired width are rotatably supported upon aframe and between them is located a correspondin roll 3 of tin foil or other desired material to orm the lates of the condensers, the width of the foil eing a little less than that of the paper as shown in Fig. 2. These strips of paper and tin foil are carried up over the rolls 5 at the upper part of the frame and thence down over a second roll 6 to the Wind- .mg form 7. Two such sets of rolls are emloyed since the tin foil from the rolls 3 orms the two plates of the condenser. When the handle 8 of the form 7 is rotated, therefore, the material is drawn off from the said rolls and forms an oblon or flattened roll 9 as shown in Fig. 3, the p ates being between two'strips of the aper, although but one could be employe the terminals 10 consist' of thin metal strips, preferably of tinn copper ribbon, being slipped into position in contact with the two strips of tin a er has been .found satisfactory for the ie ectric. As shown in Fig. 2, one or more rolls 9 may be formed at the same time.- Fi 4 shows the roll after it is removed from t e form 7. Other forms of rolls may be used but that shown is preferred.

The mold which I prefer to use in forming the condensers consists of side members or pieces '11 preferabl in the form of iron bars or plates of consi erable thickness and the bottom piece of block 15, to which said side ieces are bolted by means of the bolts 16. li`he upper corners of the side members are joined to ether by the clamping bolts 17 carrying t e sleeves 18 between the said side pieces 4. Within this mold is placed a sheet metal trough 19 ada ted to it closely therein and into W 'ch the olded rolls 9 are placed, with a block or bar 20 adapted to iit within said trough 19 resting upon them. This trough and mold are made of sufcient length to accommodate a plurality of rolls 9 as shown in Figs. 6 and 7, neither the trough nor the mold being closed at theiry ends. Suitable apertures 21 are rovided in the side members 11 ofthe mol which coincide with similar apertures in the sides of the trough 19. Although a single mold is .shown it is apparent that it may be made wlder to form several molds.

, After the roll has been formed as in Fig. 4, it'is doubled or folded up into two or more layers which may be referred to as U, S,`or wform, las indicated in Fi 12, 11 and 13, respectively. After the ro s are folded up as stated they are placed within the troughs 19 which have been removed from the molds but with the Weights 20 resting upon them, and are placed in a bath 22 of molten paraflin or other insulating substance which is maintained at a temperature of from 240 to 260 degrees Fahrenheit and are allowed to remain there for from three to' five hours until the rolls are thoroughly impregnated with the paraffin and the moisture and air are driven off. This method of boiling the condensers in paraffin dispenses with the necessity of baking the dry condensers' in ovens to drive off the moisture inthe layers. This bath is suitably heated by a steam 'acket or chamber 23 as indicated in Fig. 5; t ough of course any method of heating the parafn may be employed. When thus immersed Withln the paraffin the open ends of the trough, as well as the apertures in the. sides thereof between the condensers, permit the free flow of the liquid in and aboutthe folded v rolls.

After the condensers have been placed in the mold the up er bolts 17 are tightened closely against t e sides of the trou h to press the latter closely againstY the s1 es of the bar'20; they are then subjected to heavy pressure in the press 24 shownin Fig. 9 or 1n any suitable ress, and the block 20 is forced down upon t e condensers toA compress them to the desired amount. In thus compressing the condensers they completely fill the space in the trough of the mold and cause them to assume a rectangular cross-section as indicated in Figs. 11 and 12. The plates of the condenser are thus brought into yintimate contact atlall oints, including the ends-of the rolls, and t e capacity and insulation of the same are increased. Afterremaining in the molds under compression for from two to four hours they are sufficiently cool to be removed andare then in the form shown in the various figures. If the molds are taken out of the press 24 before they are cool suit-able clamps may be applied to the molds to hold the bars 20 down in osition and the molds then removed from t e press to make room for others. y

In Figs. 11 and 12 I show the condenser provided with a lead or other sheet metal core 25 placed in the roll before it is folded taining the form of the condenser after ressure has been removed. The termina s 10 are slipped into the roll at the proper time at the beginning of the rolling operation, the one in contact with one plate or tin foil strip and the other with the other plate of strip of foil, both of course being out of contact with the metallic core 25.

A suitable casing or box 26 shown in Fig. 13 of tin or other desired material and of about the size of the condenser after it has been compressed, is provided and into which the condenser is adapted to be inserted. A fiber or other insulating plate 27, adapted to fit Within the casing and having secured thereto the metallic terminals 28, is then placed in the casing on top of the condenser and the terminals 10 are soldered or other- Wise connected to the said terminals 28. When this has been done a suitable filling 29 of insulatin Wax or composition is filled in above the p ate 27 and serves to secure the same Within the casing 26. By this rocess of compressing the condensers in mol s, they may be made smaller than in the usual Way, the sheets of foil are placed in close inductive relationat the ends of the folds as well as along the sides, and a form convenient for mounting and assembling is imparted thereto.

Having thus described my invention, what I claim and desire to secure by Letters Patent isz- 1. A condenser formed of a folded roll of alternate Vconducting and nonconducting materials, of a metal core'for said condenser adapted to be folded Within said roll to main-4 tain the same in its folded position, substantially as described. I

2. A condenser formed of a folded roll of conducting and insulating sheets, of a plate about which said sheets are rolled, said plate being bent within the folds of the condenser and adapted to hold the same in its folded position, substantially as described. l

3. A condenser consisting of a roll of alternate layers of upon itself to pregnated with paraffin or s' ar insulating material and compressed upon-all sides to constitute av homogeneous ,p mass with the plates and dielectric in intimate contact at plates and dielectric from separating when the pressure is released.

A. A condenser formed of a flattened roll of alternate layers of plates and dielectric folded upon itself to form a plurality of layers, a metallic core provided for said layers, and the Whole compressed upon allsides to form a homogeneous mass with the plates in intimate relation at all points. l

fplates and dielectric folded,z

orm several la ers and iml "all points and internal means to prevent the iso 5. A condenser formed of alternate sheets Signed by me at Chicago, county of Cook, of conducting and insulating material, of a State of Illinois, in the presence of two Witcore about which'said sheets are wound, said nesses.

core and sheets bein adapted to be folded FRANK SQ KOCH. 5 integrally, whereby t e rigidity of the core Witnesses:

maintains the folded ositlon of the sheets, ROBERT LEWIS AMES,

substantially as described. t EDITH F. GRIER. 

